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Guitar Effects Unit (Octaver-Fuzz)
extracted from ETI-Canada, January 1980 +9v 10k 10k 10k
+

6.8k 10k
-

D1 a 100k

D2

10k

+9v
+

1.0uf 680k 560pf Q1 1M

+

b 1k

-9v
+

IN

1.0uf 270ohms

8.2k

39k Fuzz Struzz S3

1k

820 ohms

S2 OUT -9v 9v
+

On S1 Off 9v

+

+9v

Q1 is MPS6515 DI and D2 are 1N4148 The IC is any lownoise dual op-amp, shown is the 4558. Switching could be improved with a full bypass mod. The GEU is good sounding octave fuzz, with an optional mode of just fuzz. The fuzz is a fully rectified signal and is quite chewy. For some the Fuzz alone might not be loud enough, this can be fixed by raising the value of the 820 ohm resistor and lowering the 39k one. Or one could just replace both with a normal volume pot for a more standard approach. The "struzz" is the fuzz with an octave higher signal mixed in. Good for singal notes and leads.